More or Less: Behind the Stats

Tim Harford talks to economist Dan Ariely about the psychology of money. They discuss how understanding the way we think about our finances can help us to spend more carefully and save more efficiently. Plus Dan explains how to never have an argument over sharing a restaurant bill again.(Photo: Mannequins in a shop window wearing sale t-shirts. Credit: Sean Gallup/Getty Images)

The World Health Organisation say that 95% of people who live in cities breathe unsafe air. But what do they mean by ‘unsafe’? And how do they calculate the levels or air pollution for every city in the world? Plus Mt Etna in Italy has reportedly moved by 14mm, but who is calculating this? And how do they know the answer with such accuracy? (Photo: People wear masks as smoke billows from a coal fired power plant, Shanxi, China. Credit: Kevin Frayer/Getty Images)

London’s murder rate is on the rise – and for the first time ever it has just overtaken New York’s, according to a number of media outlets. But is it true? And is it appropriate for journalists to compare between the two cities? South Africa’s missing children statistics A viral Facebook post has suggested that one child is kidnapped every thirty seconds in South Africa. We examine the evidence which shows that a child is reported missing every nine hours to the police, and this includes more than just kidnappings. (Photo: Police officers inspect the scene of a knife attack in London. Credit: Jack Taylor/Getty Images)

Miss Fisher’s Murder Mysteries is one of Australia’s most popular television series and has been broadcast in 172 territories worldwide. Set in 1920’s Melbourne the series’ protagonist, Miss Phryne Fisher, seems to have a lot of dead bodies on her metaphorical plate. So how does the series compare with the real life murder rate at that time? Join the More Or Less team as we step back in time for some statistical sleuthing.

Last week Vladimir Putin won a second consecutive and fourth overall term as the Russian President. Official polling results from the election show he received over 76 percent of the vote, with a total turnout of 67 percent, but there were also widespread allegations of irregularities including inflated turnout figures. More or Less takes a closer look at the election data from Russia to see if these complaints have merit.

Whenever Donald Trump talks about trade he brings up one statistic again and again, the US trade balance. This is the relationship between the goods and services the US imports from other countries and what it exports – if America buys more from a country than that country buys from America there’s a deficit, and Trump claims America has a trade deficit with almost every country in the world.Is he right?We unpick whether President Trump is quoting the correct numbers on trade, hear how trade figures can vary widely between countries and ask if it’s the right approach to focus trade deal negotiations on reducing the US deficit.(Photo: President Donald Trump participates in a meeting with leaders of the steel industry at the White House, Washington, DC. Credit: Win McNamee/Getty Images)

After Sir Roger Bannister ran a mile in under four minutes, did positive thinking propel dozens to do the same?

Are Hollywood films ignoring women? As this is the 90th year of the Academy Awards - we find out how many ‘Best Picture’ winners pass the Bechdel Test. This is a light-hearted way of challenging whether a film meets a low standard of female representation. They have to fulfil three criteria: are there at least two named female characters in the cast? Do those two women speak to each other? And do they have a conversation about something other than a man? In collaboration with the BBC’s 100 Women team, we reveal the answer but also look at what other ways we could be assessing representation in film.

What’s the most successful nation? (0’40”) We look at population, GDP per capita and ski areas of the countries with the most medals.How do you judge a country’s ‘best’ performance? (3.45”)What are the chances of dead heat in a race? (6’35”) The two-man bobsleigh event ended in a dead heat with both Canada and Germany achieving a time of three minutes 16.86 seconds.Is this the coldest winter games? (8’41”)

How to question dubious statistics in just a few short steps.